Fucoidin methylated

Conchie and Percival97 found that the direct methylation of fucoidin with dimethyl sulfate and sodium hydroxide was more satisfactory than the simultaneous deacetylation and methylation of its acetyl derivative. Methylated fucoidin was hydrolyzed and the products were converted to their methyl glycosides. By chromatography on alumina there were isolated methyl L-fucosides (about 20%), methyl 3-methyl-L-fucosides (57%) and methyl 2,3-dimethyl-L-fucosides (20%). 

From the above delineated results, from the fact that unsubstituted L-fucose was a hydrolytic product of methylated fucoidin, and from the... 

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